Window jack



Aug. 13, 1946.

FIG. I.-

F. J. CANTRE LL WINDOW JACK Filed Feb. 28, 1945 INVENTOR. FRANK JQ CANTRELL Patented Aug. 13, 1946 WINDOW JACK Frank J. Cantrell, San Francisco; Calif; assignor of forty-nine per cent to Eleanor Josephine Koch, San Francisco, Calif.

Application February 28, 1945, Serial.No."580,183

4 Claims. 1

"This invention relates to window jacks, and more particularly to a safety window seat especially useful in supporting persons engaged in washing, polishing or otherwise working on the exterior of windows in buildings.

Principal objects of this invention are to provide a seat which may be easily afiixed to any given window in a manner insuring safety of the user thereof; to provide a seat which is compact in design, which may be quickly and efficiently transported from place to place and fixed in operative position with a minimum effort; and to provide a seat adapted to be used by Window cleaners, or the like, which may be adjusted conveniently in accordance with the individual desire of the user after initial positioning and occupancy of the seat. A further object of the invention. is .to provide a window'jack, haVing adjustable safety elements, obviating difficulty of attachment to various designs of window structure.

Further objects are to provide a window jack which is sturdy of construction and simple in design and which may be manufactured at low cost; and to provide a unitary Window jack, wherein safety and. comfort are combined without sacrificing simplicitylo-f use and structure. Other objects and advantages willv be apparent upon reference to the accompanying specification and drawing in which similar characters of reference represent corresponding parts in the several views.

Fig. 1 is a side elevation of my invention attached to a window of conventional construction.

Fig. 2 is a top plan view of my invention.

Fig. 3 is a bottom plan view of my invention with the sill support member partly broken away.

Fig. 4 is a fragmentary sectional view taken on line IVIV of Fig. 2.

Referring to the drawing, the novel window seat is disclosed attached to a conventional window structure wherein A represents the interior moulding sill and B the exterior inclined sill or window ledge. C represents a conventional window frame vertically slidable in casement D.

A platform member is generally indicated at H) and is provided with a back rest I! which may be rigidly or integrally attached to the platform member or in any suitable manner. Horizontal base members l2 are rigidly afiixed to the sides of the platform member Ill and extend forwardly thereof. Cross member i3 is rigidly attached to the forward ends of members l2 and is preferably formed to extend laterally a short distance beyond members I2 to form safety stop portions 14 adapted to abut against the inner wall or casement D when the seat is "in operative position.

Vertical posts l5 are rigidly affixed tomembers 12 in front of the platform member ID and are "preferably formed .so that they curve slightly away from the platform member to form camm-ing surfaces, as at. A hook member -l'l is ,slidably carried under platform Ill and cross member l3, the hook portion l8 thereof being adapted to engage the interior moulding sill A. The shank of the hook member .H is provided with longitudinal slots 20 and 2|. Slot .20 is provided with a threaded bolt 22 having a flat head which is slidable in said slot and adapted to project upwardly therethrough and through an aperture provided in cross member l3. Said bolt carries a wing-nut, or the like, 23. By tightening nut 23 the hook member may be clamped in a fixed position relative to cross member l3. Hence by regulation of hook member I! the platform member may-be readily adjusted to form an effective safety hook' for use with varying window constructions.

It is noted thata' guide stud 25, rigidly fixed to platform member 10, projects through slot 2| and .acts as a guide for hook member l'l'to prevent lateral movement thereof relative to said platform member. It is also noted that a groove maybe provided incross member 13 to receive the shank portion of hook member I 7. In the drawing, the slot has been omitted for clarity of illustration.

An axle 26is pivotally mounted in bearings 21, provided on base members l2 and positioned below approximately the forward edge of platform member In. Adjustable sill support 28 is rigidly or integrally fixed to said. axle so that it may swing vertically relative to base members l2 and platform member In. The support 28 comprises a flat piece of metal or other suitable material having an aperture 29 provided therein at the rear and centrally thereof. In the drawing, the support 28 is shown as generally triangular in form, but it is obvious that it may be rectangular or other shape.

A hole 36 is provided in platform number l0 near the rear thereof. A nut-forming member 3! is fixed on the underside of platform member IE3 and is vertically spaced therefrom. A bolt 32 is threadably carried in said nut-forming member so that the knurled head 33 thereof is located below the platform member ID. Preferably the nut-forming member 3| comprises a bracket fixed 32 it is possible to elevate and lower the platform member relative to the building to which it is attached. The operator may have assumed his seat in the window jack and desire to elevate or lower himself relative to the window and may accomplish this purpose by simple manipulation of the bolt 32 by access thereto through hole 30.

From the above description it is clear that there are a number of safety'and comfort features incorporated in the window jack, namely, an adjustable hook member ll adapted to be positioned so that the hook portion thereof is fixed relative to the interior moulding sill of a window; a pair of verticalposts I5, adapted to be positioned adjacent to the interior face of window frame 0, stop portions l6 adapted to abut against casement D; and bolt 32 adapted to regulate the vertical positioning of the device relative to the window after the operator has assumed his working position.

Although I have described the invention in more or less detail, it is understood that various modifications and variations may be practiced within the spirit of the invention'and scope of the appended claims.

I claim:

1. In a window jack having afplatform member and base members rigidly aifixed thereto, a hook member slidable horizontally relative to said platform member, means to fix said hook member in rigid position, support means pivotally mounted on said base members and movable vertically relative thereto, and a unitary means to move said support means including a nut-forming member carried by said'platform member, said last named unitary means positioned under said platform and in vertical alignment with an aperture formed therein whereby said means may be regulated by an operator after occupancy of said window jack in order to raise or lower said platform without tilting said platform.

2. In a window jack having a platform member and base members rigidly afiixed thereto, support means pivotally mounted on said base members and movable vertically relative thereto, a nut-' forming member rigidly affixed to said platform member and vertically spaced from the underside thereof, a bolt threadably carried in said nutforming membe and rotatively engaged to said support member, and means provided in said platform member in vertical alignment with said bolt whereby ready access may be had to cause manual regulation of said bolt by an operator after occupancy of said window jack in order to raise or lower said platform without tilting said platform.

3. In a window jack having a platform member and base members rigidly afiixed thereto, a pair of vertical stops adapted to abut against a relatively unmovable object, a hook member slidable horizontally relative to said platform member, means to lock said hook member in a fixed position, a sill support pivotally mounted to the underside of said base member, a nut-forming member rigidly afiixed to the underside of said platform member and vertically spaced therefrom, a bolt threadably carried in said nut-forming means and rotatively engaged to said support member, and means formed in said platform member in vertical alignment with said bolt, whereby an operator may have ready access to said bolt for manual regulation thereof after occupancy of said window jack.

4. In a window jack having a platform member and base members affixed thereto, a hook member slidable horizontally relative to said platform member and adapted to engage a window sill, means to fix said hook member in rigid position, a support member pivotally and slidably mounted on said hook member, means to lock said support member to said hook member, a support means pivotally mounted on said base members and movable vertically relative thereto, unitary means to move said support means including a nut forming member carried by said platform member, and means formed in said platform invertical alignment with said unitary means whereby an operator may have ready access to said unitary means for manual regulation thereof after occupancy of the said window jack.

FRANK J. CANTRELL. 

